Bus device which abstains from round robin arbitration

Details Bus device which abstains from round robin arbitration Bus device which abstains from round robin arbitration

1989-07-21

1992-06-02

Fleming, Michael R.

Boots, shoes, and leggings

3642408, 3642426, 36424292, 36493701, 364DIG1, 364DIG2, G06F 1336

Patent

active

051192926

ABSTRACT:
A first-type bus device is designed for use in a computer system having one or more second-type bus devices. The second-type devices practice a round robin arbitration scheme, but the first type devices do not. According to the round-robin scheme, a second-type device which wins an arbitration asserts its ID on the system bus, each second-type device seeking to arbitrate compares its ID with that asserted by the current bus master, and uses that comparison to determine whether to assert its ID during arbitration in a high or low priority manner. The first-type bus device includes means for assuring that first-type and second-type devices never arbitrate at the same time. During arbitration, first-type devices only assert their ID number in one priority. Unlike second-type devices, they cannot assert their ID either in a high or low priority manner. Each first-type device has means for being given a selectable ID number, but when a first type device becomes bus master, it asserts an ID number which is independent of its selectable ID number. The ID number asserted could be the ID number of the first device to become bus master after the computer containing the first-type device is turned on. It also could be a fixed ID number which is fixed independently of the ID number selected for the first-type device.

REFERENCES:
patent: 4257095 (1981-03-01), Nadir
patent: 4583160 (1986-04-01), Iguma
patent: 4787033 (1988-11-01), Bomba et al.
patent: 4817037 (1989-03-01), Hoffmann et al.
patent: 4858234 (1989-08-01), Harwell et al.

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